Please I need to make satellite dish but know how to get the calculations of the parabola . MATTHEW

Question

The size of the dish is , 4.7 meter , focal point is 1.8 meter with dept of about .76 meter

Answer 1

Using an equation for a parabola (pointing upwards):

x^2 = 4ay

a = the focus, so 1.8 meters

the depth is y = 0.76 meters

So we will calculate the size of your dish and see if it matches you 4.7 meters (we're hoping x = 4.7/2 = 2.35)

x^2 = 4(1.8)(0.76)

x^2 = 5.472

x = 2.339 meters

So it seems like your dish size may be a bit large. You can use this equation and fix whichever variables you want to rework the problem.